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Titolo:
COPPER(II) COMPLEXES OF NOVEL TRIPODAL LIGANDS CONTAINING PHENOLATE AND BENZIMIDAZOLE PYRIDINE PENDANTS - SYNTHESIS, STRUCTURE, SPECTRA ANDELECTROCHEMICAL-BEHAVIOR
Autore:
UMA R; VISWANATHAN R; PALANIANDAVAR M; LAKSHMINARAYANAN M;
Indirizzi:
BHARATHIDASAN UNIV,DEPT CHEM TIRUCHCHIRAPPALLI 620024 INDIA BHARATHIDASAN UNIV,DEPT CHEM TIRUCHCHIRAPPALLI 620024 INDIA INDIAN INST SCI,DEPT INORGAN & PHYS CHEM BANGALORE 560012 KARNATAKA INDIA
Titolo Testata:
Journal of the Chemical Society. Dalton transactions
fascicolo: 8, , anno: 1994,
pagine: 1219 - 1226
SICI:
0300-9246(1994):8<1219:CCONTL>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPIN-RESONANCE SPECTRA; CRYSTAL-STRUCTURE; ELECTRONIC-PROPERTIES; MOLECULAR-STRUCTURE; IMIDAZOLE LIGANDS; O,N LIGANDS; DERIVATIVES; TETRAFLUOROBORATE; COORDINATION; PROTEINS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
46
Recensione:
Indirizzi per estratti:
Citazione:
R. Uma et al., "COPPER(II) COMPLEXES OF NOVEL TRIPODAL LIGANDS CONTAINING PHENOLATE AND BENZIMIDAZOLE PYRIDINE PENDANTS - SYNTHESIS, STRUCTURE, SPECTRA ANDELECTROCHEMICAL-BEHAVIOR", Journal of the Chemical Society. Dalton transactions, (8), 1994, pp. 1219-1226

Abstract

Mononuclear copper(II) complexes of tri- and tetra-dentate tripodal ligands containing phenolic hydroxyl and benzimidazole or pyridine groups have been isolated. They are of the type (CuL(X)].nH2O, [CuL(H2O)]X.nH2O or [CuL].nH2O where X = Cl-, ClO4-, N3- or NCS- and n = 0-4. Theelectronic spectra of all the complexes exhibit a broad absorption band around 14000 cm-1 and the polycrystalline as well as the frozen-solution EPR spectra are axial, indicating square-based geometries. The crystal structure of [CuL(Cl)] [HL = -hydroxy-5-nitrobenzyl)bis(2-pyridyl-methyl)amine] revealed a square-pyramidal geometry around Cu(II). The mononuclear complex crystallises in the triclinic space group P1BARwith a = 6.938(1), b = 11.782(6), c = 12.678(3) angstrom and alpha = 114.56(3), beta = 92.70(2), gamma = 95.36(2)-degrees. The co-ordination plane is comprised of one tertiary amine and two pyridine nitrogens and a chloride ion. The phenolate ion unusually occupies the axial site, possibly due to the electron-withdrawing p-nitro group. The enhanced pi delocalisation involving the p-nitrophenolate donor elevates the E1/2 values. The spectral and electrochemical results suggest the order of donor strength as nitrophenolate < pyridine < benzimidazole in the tridentate and nitrophenolate < benzimidazole < pyridine in the tetradentate ligand complexes.

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Documento generato il 04/12/20 alle ore 19:38:26